Torque Ripple Reduction in Reluctance Synchronous Machines using an Asymmetric Rotor Structure

2014 ◽  
Author(s):  
T. Lange ◽  
B. Kerdsup ◽  
R.W. De Doncker ◽  
C. Weiss
Keyword(s):  
Torque Ripple ◽  
Synchronous Machines ◽  
Torque Ripple Reduction ◽  
Asymmetric Rotor ◽  
Ripple Reduction ◽  
Rotor Structure

Saliency enhancement and torque ripple reduction of wound field synchronous machine by injecting optimum harmonic in rotor shape

2020 ◽  
Vol 64 (1-4) ◽  
pp. 447-455
Author(s):  
Wenping Chai ◽  
Byung-il Kwon
Keyword(s):  
Torque Ripple ◽  
Air Gap ◽  
Synchronous Machines ◽  
Torque Ripple Reduction ◽  
Harmonic Injection ◽  
Ripple Reduction ◽  
Low Torque ◽  
Rotor Shape ◽  
Traction System ◽  
Flux Density Distribution

This paper presents a new rotor shape design with optimum reverse 3rd harmonic for wound field synchronous machines to effectively enhance the saliency ratio and reduce the torque ripple in a micro electric vehicle traction system. Due to the enhanced saliency ratio, the reluctance torque is expected to be improved. The air gap flux density distribution is reshaped by the new rotor shape method, which benefits the low torque ripple. By contrast, the reverse 3rd harmonic injection is much more suitable than the general 3rd harmonic injection for increasing the effective air gap length along the q-axis for a high saliency ratio. Subsequently, three amplitudes of the reverse 3rd harmonic are studied and it is found that the optimum reverse 3rd harmonic is 1/6 of the fundamental one. To verify the effectivity of the proposed design, the original model and the ICS model are compared. Finally, all the motor characteristics, such as back electromotive force, cogging torque, and electromagnetic torque, are predicted using a 2-D finite-element method with the aid of JMAG-Designer.

Torque Ripple Reduction Using Torque Compensation Effect of an Asymmetric Rotor Design in IPM Motor

2017 ◽  
Vol 22 (2) ◽  
pp. 266-274
Author(s):  
Yong-Suk Hwang ◽  
Myung-Hwan Yoon ◽  
Jin-Cheol Park ◽  
Jung-Pyo Hong
Keyword(s):  
Compensation Effect ◽  
Torque Ripple ◽  
Rotor Design ◽  
Torque Ripple Reduction ◽  
Asymmetric Rotor ◽  
Ripple Reduction
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